Scatter point with matrix blocks

Hi,

Make a scatter diagram like the below attached one? I've got period on my x axis and wave height on the y axis, but would like to group them and can't figure that out. Appreaciate your help.

figure(1)
scatter(T_p,H_s)


figure(2)
scatter(z,H_s)

[darova]

How do you want to group them? Maybe by high water level z(m)?

[Hozan Sulaiman]

Just as the figure I've uploaded, within an interval of height and water level, how many points I've got.

Thank you.

Answer 1

[Mathieu NOE]

hello

this coud do the trick

example below :

%% generate a test matrix
A = round(10*rand(20, 20));

%% visualize the matrix
matvisual(A, 'annotation')
grid off

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%   Matrix Visualization with MATLAB Implementation    %
%                                                      %
% Author: Ph.D. Eng. Hristo Zhivomirov        12/02/18 %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function matvisual(A, varargin)

% function: matvisual(A, varargin)
% A - m-by-n matrix to be visualized with up to 3 pages
% varargin - type 'annotation' in the place of varargin if one want to
%            annotate the matrix plot (x-label, y-label, etc.)

% check the input
if ~isreal(A) | isempty(A) | ischar(A) | ndims(A) > 3
    errordlg('The data array is not suitable for visualization!', ...
             'Error!', 'modal')
    return
end

% determine the matrix size
[M, N, P] = size(A);

% loop through the matrix pages
for p = 1:P
    
    % prepare page-by-page visualization
    if P > 1, subplot(1, P, p), end 
    
    % visualize the matrix
    himg = imagesc(A(:, :, p));
    grid on
    
    % annotation
    if strcmp(varargin, 'annotation')       
        % x-label, y-label, x-ticks, y-ticks, title
        set(gca, 'FontName', 'Arial', 'FontSize', 12)
        xlabel('Column number')
        ylabel('Row number')
        if P > 1, title(['Matrix page ' num2str(p)]), end
        if M <= 50, set(gca, 'YTick', 1:M), end 
        if N <= 50, set(gca, 'XTick', 1:N), end              
    end
        % values labeling
        for m = 1:M
            for n = 1:N
                text(n, m, num2str(A(m, n, p), 3), ...
                    'FontName', 'Arial', ...
                    'FontSize', round(6 + 50./sqrt(M.*N)), ...
                    'HorizontalAlignment', 'center', ...
                    'Rotation', 45)
            end
        end
            
%     % set the datatip UpdateFcn
%     cursorMode = datacursormode(gcf);
%     set(cursorMode, 'UpdateFcn', {@datatiptxt, himg})

end

end

function text_to_display = datatiptxt(hDatatip, himg)

% determine the current datatip position
pos = get(hDatatip, 'Position');

% form the datatip label
text_to_display = {['Row: ' num2str(pos(2))], ...
                   ['Column: ' num2str(pos(1))], ...
                   ['Value: ' num2str(himg.CData(pos(2), pos(1)))]};

end

[Hozan Sulaiman]

Hi, it doesn't, this is basically what I've written :

Mdata = scatter_function("C:\m\P2\Mdata.xlsx", "1210467 - Metocean study for th", [11, 175330]);

%U_10= Mdata(:,2)

%Wind_D=Mdata(:,4)

H_s=Mdata(:,6)

T_p=Mdata(:,8)

%Wave_D=Mdata(:,10)

z=Mdata(:,12)

%Uc_x=Mdata(:,14)

%Uc_y=Mdata(:,16)

figure(1)

scatter(T_p,H_s)

figure(2)

scatter(z,H_s)

You've used a matrix, I'm not sure I know how to use it for the 2 different vectors I've got.

So these 2 figures are what I get, and I want to split those into intervals as you've shown.

Thank you for your help

[Mathieu NOE]

hello

IMO you have to plot a Bivariate histogram plot

Bivariate histogram plot - MATLAB (mathworks.com)

then either you stick to the graphical 3D rendering (example of the histogram2 function )

, or you can use my previous suggestion

hope it helps